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Question-1. What is semi conductor diode laser?
Answer-1: Semiconductor diode laser is a specially fabricated pn junction diode. It emits laser light when it is forward biased.
Question-2. What is LASER?
Answer-2: The term LASER stands for Light Amplification by Stimulated Emission of Radiation. It is a device which produces a powerful, monochromatic collimated beam of light in which the waves are coherent.
Question-3. What are the characteristic of laser radiation?
Answer-3: Laser radiations have high intensity, high coherence, high monochoromation and high directionality with less divergence.
Question-4. Define numerical aperture ?
Answer-4: Numerical aperture is defined as the light gathering capability of an optical fiber. It is the sine of the acceptance angle. NA=sineφa
Question-5. What is the principle used in fiber optic communication system?
Answer-5: The principle behind the transmission of light waves in an optical fiber is total internal reflection.
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